Question

我有一个列表项列表，默认情况下显示为：none。我以编程方式将其中的一定数量更改为列表项。

我一直在尝试使用querySelectorAll但是当我尝试时：

document.querySelectorAll("#ulname style[display*='list-item']")

它返回一个空数组（我知道它至少有一个）。

关于如何修改我的选择器或其他方法的想法？我想知道显示了多少项目。

Answer 1

   var liList = document.getElementById("myul").getElementsByTagName("li");

   var largo = liList.length

   alert(largo);

WHERE“ myul ”是列表的ID， largo 是li项目的数量

<ul id="myul">
    <li>hello</li>
    <li>world</li>
</ul>

警报将是2

<ul id="myul">
    <li>hello</li>
    <li>world
        <ul>
            <li>here we are</li>
        <ul>
    </li>
</ul>

警报将是3

Answer 2

    var ul = document.getElementById("myul");
    var liNodes = [];

    for (var i = 0; i < ul.childNodes.length; i++) {
        if (ul.childNodes[i].nodeName == "LI") {
            liNodes.push(ul.childNodes[i]);
        }
    }

totalLis = liNodes.length;

在ul标签中添加文字

var txt = document.createTextNode("gsdgds");
ul.appendChild(txt);

将li标签添加到ul标签

var txt = "<li>dsgdsgs</li>";
ul.innerHTML(txt);

Answer 3

<!DOCTYPE html>
<html>
<body onload="myFunction()">

<p>Maybe this answer can help. I improvise for this after a few days of testing. This is what I got. Hope it helps you.</p>


<li class="sidenav-item open active">
            <a href="#" class="sidenav-link sidenav-toggle" ></i>
              <div class="text-white">Hi, There!
                <div class="badge badge-primary" id="ul-me"></div></div>
            </a>

            <ul class="sidenav-menu" id="ul1">
              <li class="sidenav-item active">
                <a href="#" class="sidenav-link" >
                  <div class="text-white" >Home</div>
                </a>
              </li>
              <li class="sidenav-item" id="ul2">
                <a href="#" class="sidenav-link" >
                  <div class="text-white" >Blog</div>
                </a>
              </li>
              <li class="sidenav-item" id="ul3">
                <a href="#" class="sidenav-link" >
                  <div class="text-white" >Downloads</div>
                </a>
              </li>
              <li class="sidenav-item" id="ul4">
                <a href="#" class="sidenav-link" >
                  <div class="text-white" >Contact</div>
                </a>
              </li>
              <li class="sidenav-item" id="ul5">
                <a href="#" class="sidenav-link" >
                  <div class="text-white" >About</div>
                </a>
              </li>
            </ul>
</li>
'''
<!-- Count Item (li) in <ul> -->

<script>
function myFunction() {
  var mylist = [document.getElementById("ul1"), ("ul2"), ("ul3"), ("ul4"), ("ul5")];
  document.getElementById("ul-me").innerHTML = mylist.length;
}
</script>

</body>
</html>

计算HTML列表中显示的元素数

3 个答案: